Hello . Can I talk to David ?   One second , please . ( a few seconds later , the receiver comes back and says ) Hello ?   Yes .   I ’ m sorry . David is out to lunch right now .   Okay . I ’ m his wife . Could you tell him to call me back when he returns ?   Sure . Does he know where to call you ?   Oh , thanks . Please tell him to call my cell-phone number .   Ok , I will .   Thank you very much .   No problem . 